@article{JGAA_2019_23_1_a4,
     author = {Yuko Kuroki and Tomomi Matsui},
     title = {Approximation {Algorithm} for {Cycle-Star} {Hub} {Network} {Design} {Problems} and {Cycle-Metric} {Labeling} {Problems}},
     journal = {Journal of Graph Algorithms and Applications},
     pages = {93--110},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2019},
     doi = {10.7155/jgaa.00485},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00485/}
}